Fire in the hydrochloric acid synthesis exhaust pipe
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The exhaust pipe for hydrochloric acid synthesis is prone to being struck by lightning and catching fire; can introducing nitrogen at the front end of the exhaust pipe help to extinguish the fire? The vent pipe is made of stainless steel and is grounded; it is difficult to see clearly from a distance when on fire. How can the flames be made more visible?
This can only be detected through inspections; during thunderstorm weather, nitrogen should be turned on in advance
What are the main components of the exhaust gas from hydrochloric acid synthesis? Does it contain hydrogen chloride? Can it be vented directly?
It should contain hydrogen, right? A hydrogen flame is pale blue, and it is indeed difficult to detect. You can try installing a heating element at the top of the vent pipe to check whether the temperature is abnormal. Adding steam or nitrogen can both extinguish the fire
During the synthesis of hydrochloric acid, in order to ensure that chlorine reacts as completely as possible and to avoid the presence of free chlorine in the hydrogen chloride produced at the outlet of the synthesis furnace, industrial production involves controlling the feed to the synthesis furnace such that there is a slight excess of hydrogen over chlorine; as a result, the hydrogen gas concentration in the exhaust gas used for hydrogen chloride absorption is relatively high. Therefore, a flame arrester should be installed in the exhaust gas emission pipeline for hydrogen chloride absorption, and a nitrogen pipeline should be provided at the top of the hydrochloric acid tank (to prevent trace amounts of hydrogen dissolved in the hydrochloric acid from accumulating at the tank top).
The main thing is to control the excess percentage of hydrogen well; by doing so, ignition accidents will be significantly reduced – it’s a matter of management.
Even when the hydrogen/chlorine ratio of the feed to the synthesis furnace is well controlled, incidents such as the explosion and ejection of the roof cover of the hydrochloric acid tank still occur from time to time. If no nitrogen pipeline is installed at the top of the hydrochloric acid tank and a low flow rate of nitrogen is not supplied for protection, the trace amounts of hydrogen dissolved in the hydrochloric acid during the absorption process will accumulate at the top of the tank, creating an explosive hydrogen environment above the liquid surface. When volatile acid mist forms droplets and falls from the tank wall to the liquid surface, static electricity is likely to be generated, leading to explosions.
Hello, manager. Flame monitoring equipment can be added; changes can be seen on the images. Feel free to contact me at 13696518235 if you need any further information. It’s Zhu Jiachun; my WeChat ID is the same.